# 按照这个顺序来定义参数：必填参数、位置不定长参数、默认参数、关键字不定长参数
def fn1(a, b, *args, country='china', **kwargs):
    print(a, b)
    print(args)
    print(country)
    print(kwargs)

fn1(1, 2, 'aa', 'bb', country='usa', age=18, addr='newyourk')







